<?php
	class demo{
		function say(){
			echo "demo say";
		}
	}
	class demo1 extends demo{
		function say(){
			//parent::say();//target 
			//echo "demo1 say";
		}
		function __destruct(){
			echo 3434;
		}
	}
	$obj  = new demo1();
	$obj->say();
	//__call __isset __unset __get __set  
	// $obj=null;
	// echo 111;
	//GC
?>